Hello XXXXXXXX,
It sounds like there has been some kind of trauma to his prepucial area. There was bleeding under the prepuce which has now formed a hematoma (blood blister under the skin). When he goes to urinate the penis passes there the prepuce and the hematoma. Blood and clots then get on his penis and fall to the ground while he urinates.
I would recommend putting an ice pack on the area for 20 minutes every few hours.
Check his gums and skin for red spots and other signs of bruising to make sure he does not have a blood clotting disorder. If you see any other signs of bruising, take him to the E.R. right away.
If there is any chance he got into rat bait, take him to the E.R. right away as that would cause abnormal bleeding.
Keep him quiet the rest of the night and tomorrow too.
Veterinarian
Specializing in Surgery, Internal medicine, Emergency, and Dermatology. All Pets With Fur